A-site substitution in Fe_1.1Te: synthesis, structure and properties

Chem. Met. Alloys 3 (2010) 155-160

https://doi.org/10.30970/cma3.0151

S.M. KAZAKOV, V.V. BELIKOV, A.V. SADAKOV, O.E. OMELYANOVSKII

The solid solutions Fe_1.1-xM_xTe (M = Ni, Co) have been synthesized in sealed quartz tubes. We observed a systematic shift of the lattice parameters for both systems till x = 0.1, then a secondary phase with NiAs-type structure appeared. For the Co-substituted samples we found a significant decrease of the c-parameter, while the variation of the a-parameter was negligible. For the Ni-doped samples the a-parameter slightly increases and the c‑parameter decreases with increasing Ni content. Magnetic measurements showed almost linear dependence of the magnetic susceptibility for (Fe_0.9Ni_0.1)_1.1Te in the T = 4-60 K range. The magnetic susceptibility of (Fe_0.9Со_0.1)_1.1Te exhibits a maximum around 25 K, indicating an antiferromagnetic transition. No superconductivity was observed in Fe_1.1-xM_xTe (M = Ni, Co) down to 4 K.

Variation of the lattice parameters as a function of the dopant content for Fe_1.1-xM_xTe (M = Ni, Co).

Keywords

Iron chalcogenides / X-ray diffraction / Crystal structure